Cross-platform mobile development can either involve a company developing the original app on a native platform (which could be iOS, Android, Windows Mobile, BlackBerry/RIM, etc.) or developing the original app in a singular environment for development that will then allow the app to be sent to many different native platforms. There are both pros and cons to cross-platform mobile app development. These tools are useful because they decrease costs and increase the speed at which apps are developed. In addition, cross-platform mobile development tools are generally quite simple to use as they are based off of the common languages for scripting, including CSS, HTML, and JavaScript.